Abstract

A numerical simulation of the stochastic resonance is carried out in the adiabatic approximation in overdamped systems based on superconducting loops closed by a weak link. The systems under consideration include a single-ring rf SQUID, two rings coupled by a common magnetic flux, and a ring closed by a 4-terminal Josephson junction. It is shown that coupling of single SQUID rings enhances the gain and the signal-to-noise ratio. These effects can be used to create new stochastic SQUIDantennas for measurements of harmonic and quasi-harmonic signals. The stochastic resonance in 4-terminal SQUIDS exists even at values of the dimensionless inductance.

Article outline:INTRODUCTIONMODEL OF STOCHASTIC RESONANCE IN A SINGLE rf SQUID RINGNUMERICAL SIMULATION TECHNIQUE AND THE RESULTS FOR A SINGLE RINGSIMULATION OF THE STOCHASTIC RESONANCE IN COUPLED RINGSMODELING THE STOCHASTIC RESONANCE IN A 4-TERMINAL SQUIDSTOCHASTIC ANTENNASCONCLUSION